Compress Image to 300KB Online
Reduce JPG, PNG, or WebP to under 300KB — free, private, 100% in your browser
Drop image here or click to upload
JPG, PNG, WebP, HEIC — max 20MB
You can also paste an image (Ctrl+V)
Why Compress an Image to 300KB?
300KB is one of the most common maximum file size limits across the web. WordPress and popular CMS platforms default to a 300KB or 500KB media upload warning. Email newsletters and marketing tools (Mailchimp, Campaign Monitor) recommend keeping inline images under 300KB to avoid slow load times in email clients. Social media platforms also compress uploaded images — starting with a file already under 300KB prevents double-compression artifacts.
Job application portals, government websites, and professional networking sites frequently require profile photos under 200–300KB. Hitting this limit while maintaining good visual quality is exactly what this tool is designed for.
What Quality Setting to Use for 300KB
The right quality setting depends on your image dimensions. Larger images require lower quality settings to reach 300KB; smaller images can be compressed at higher quality and still land under 300KB:
| Image dimensions | Recommended quality | Expected output size |
|---|---|---|
| 800×600px | 85–90 | 80–200KB |
| 1280×720px | 80–85 | 150–280KB |
| 1920×1080px | 72–78 | 200–300KB |
| 2560×1440px | 60–68 | 200–320KB — resize first recommended |
| 4000×3000px | 50–60 | Over 300KB likely — resize to 1920px first |
Start at quality 78 (the default on this page). Check the output size shown after compression. If the result is over 300KB, drag the slider left and click Re-compress to try again.
When Resizing Is Needed First
If your image is larger than 2000px wide and quality 65 still produces a file over 300KB, the issue is pixel count, not quality. A 4000×3000 image at quality 65 can still be 400–600KB because there are simply too many pixels to store compactly. The solution is to resize first:
- Use the Resize Image tool to reduce the width to 1920px or less (height adjusts automatically).
- Then compress the resized image at quality 75–80 on this page.
- The result will comfortably land under 300KB with excellent visual quality.
Common Uses for 300KB Compressed Images
- WordPress and CMS uploads — WordPress flags images over 300KB in the media library. Compressing before upload keeps your media library clean and your pages loading fast.
- Email newsletter images — Email clients load images differently from browsers. Images under 300KB load reliably in Gmail, Outlook, and Apple Mail without triggering slow-load warnings.
- Social media profile photos — LinkedIn, Facebook, and Instagram accept profile photos up to several MB, but uploading a pre-optimized 150–300KB image reduces double-compression and keeps the photo sharp in the feed.
- Job applications and professional portals — Many HR systems, LinkedIn, and job boards ask for profile photos under 200–500KB. Quality 78 at 1280px typically lands at 200–280KB — ideal for professional use.
- Web performance optimization — Images are the largest contributors to page weight. Compressing all images to under 300KB ensures your site meets Google's LCP recommendations and Core Web Vitals targets.
- Product catalog and e-commerce — Product images displayed at 600–800px on screen never need to be larger than 200–300KB. Keeping them compact speeds up shop pages and reduces bandwidth costs.
300KB vs Other Common Targets
Strict portals, government forms, exam uploads. Requires quality 50–65 — noticeable compression at full size but sufficient for ID and form use.
300KB (this tool)
CMS, email, social media, job portals. Quality 75–80 produces excellent results — the best balance of size and visual quality for everyday use.
WordPress uploads, larger web images. Quality 82–88 — near-lossless at typical screen sizes. Suitable for hero images and high-quality web use.